I have the Gameboy version, and it's actually fairly good. I mean, as good as you could ever expect it to be in 4-colours on a tiny screen. The gameplay is still mostly intact.
I always though the Genesis version was decent too. I never had any problem with it anyways.
Works nicely with a CD32 controller as well.For the record I play Turrican on my miggy with a Genesis controller... B is shoot, C is wave attack. Yeah up is jump but you really do get used to it.
--Zero